Extender White (aka Ultra Silk Mica) is a blend of Mica and Titanium Dioxide. Its best use is as a"filler" or "extender" for matte cosmetics. It isrelatively translucent and non-whitening and also has a low luster.
If you are making a purely matte product you will want to thin down your intense, pure pigments (such as red oxide, brown oxide, black oxide, ultramarine blue ... ) with something that has good adhesion, relative translucency, and low luster.
In the past we've recommended our custom-blended TKB Matte Texture Base but, to be fair, Extender White is probably a better option.
Generally, you will have about 1/3rd Extender White to pigment. It will lighten the pigment shade.
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Very long FAQ section, yet very little info! What is the suggested usage percentage for matte and shimmer products such as eye shadows?
Thanks for the feedback! I'll edit it. That verbage has been on our site for 20 years, back when things were more chatty.
The product can be used at 100% with no concerns. It will lighten/whiten a pigment so the amount you use depends somewhat on the color you are going for. A good rule of thumb would be about 1/3rd Extender White.